33
of
46
Subject to change without prior notice
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
FIRE PUMPS - NF-VTP SERIES
Ref. No. NFVTP-IOM/
2016
/V.
02
Fig. No.
28
»
Incases where set screws are used unscrew them first.
»
Whereever tack weld is used grind off it carefully.
»
Carefully cut two “V” shaped grooves approximately
180
° apart on the bowl wear ring using a diamond
point chisel without causing any damage to the wear ring set.
»
Pry out the bowl wearing ring by knocking the one end of half of the ring in using a chisel or drift.
»
Carefully cut two “V” shaped grooves approximately
180
° apart on the impeller wear ring using a diamond
point chisel without causing any damage to the wear ring set.
»
Pry off the impeller wearing ring by knocking the one end of half of the ring out using a chisel or drift.
»
Bowl bearings are press-fitted to the shaft, hence they should not be removed unless a replacement is
necessary.
»
Use an arbor press to press the bearing out with the help of a pipe or sleeve having an outside diameter
slightly smaller than the outside diameter of the bearing.
»
Use bearing pullers to pull out the suction bell bearings.
8.4. Inspection, Replacement and Reassembly
Inspect the pump parts after thorough cleaning. Check the bearing retainers for deformation and wear. Shafts should
be checked for straightness and excessive wear on bearing surfaces. Maximum allowable average total run out is
0.0005
"
TIR per foot and
0.005
" TIR for every
10
feet to shafting. Impellers and bowls should be visually inspected for the pres-
ence of cracks or pitting. Ensure that all bowl bearings are free from excessive wear and corrosion before reusing the
same. If any part is found worn or damaged to an extend that prohibits there reuse then such parts should be replaced
with new parts. Additionally, gaskets and packing should be replaced wherever their condition necessitates it.
Reassembly of the unit is basically the reverse of disassembly done in accordance with standard engineering practices.
Thorough cleaning and visual check is mandatory for all parts during reassembly. Utilize the information available
from the Fig No.
30
and the section
5
“Mounting” during reassembly and installation.
FIRE PUMP
WOODEN BLOCK
